The immature plumage in relation to the character of the plumage in both sexes when adult-Six classes of cases-Sexual differences between the males of closely-allied or representative species-The female assuming the characters of the male-Plumage of the young in relation to the summer and winter plumage of the adults-On the increase of beauty in the birds of the world-Protective colouring-Conspicuously coloured birds-Novelty appreciated-Summary of the four chapters on Birds.
We must now consider the transmission of characters, as limited by age, in reference to sexual selection. The truth and importance of the principle of inheritance at corresponding ages need not here be discussed, as enough has already been said on the subject. Before giving the several rather complex rules or classes of cases, under which the differences in plumage between the young and the old, as far as known to me, may be included, it will be well to make a few preliminary remarks.
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